Connected: An Internet Encyclopedia
RFC 821 - 4.2.2. NUMERIC ORDER LIST OF REPLY CODES

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### 4.2.2. NUMERIC ORDER LIST OF REPLY CODES

             211 System status, or system help reply
             214 Help message
                [Information on how to use the receiver or the meaning of a
                particular non-standard command; this reply is useful only
                to the human user]
             220 <domain> Service ready
             221 <domain> Service closing transmission channel
             250 Requested mail action okay, completed
             251 User not local; will forward to <forward-path>

             354 Start mail input; end with <CRLF>.<CRLF>

             421 <domain> Service not available,
                 closing transmission channel
                [This may be a reply to any command if the service knows it
                must shut down]
             450 Requested mail action not taken: mailbox unavailable
                [E.g., mailbox busy]
             451 Requested action aborted: local error in processing
             452 Requested action not taken: insufficient system storage

             500 Syntax error, command unrecognized
                [This may include errors such as command line too long]
             501 Syntax error in parameters or arguments
             502 Command not implemented
             503 Bad sequence of commands
             504 Command parameter not implemented
             550 Requested action not taken: mailbox unavailable
                [E.g., mailbox not found, no access]
             551 User not local; please try <forward-path>
             552 Requested mail action aborted: exceeded storage allocation
             553 Requested action not taken: mailbox name not allowed
                [E.g., mailbox syntax incorrect]
             554 Transaction failed

Next: 4.3. SEQUENCING OF COMMANDS AND REPLIES

Connected: An Internet Encyclopedia
RFC 821 - 4.2.2. NUMERIC ORDER LIST OF REPLY CODES